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Broadbent, Nicola Lumeij, Lucas Berend Corcoles, Marta Ayres, Alice I Bin Ibrahim, Mohammad Zaki Masatsugu, Brittany Moreno, Andrea Caramés-Tejedor, José María Begg, Elizabeth Strickland, Lauren Mazidzoglou, Theofilos Padanyi, Anna Munoz-Lopez, Monica Takeuchi, Tomonori Peters, Marco Morris, Richard RGM Tse, Dorothy Munoz-Lopez, Monica 2024-09-26T06:44:39Z 2024-09-26T06:44:39Z 2020-01-16 Broadbent, N., Lumeij, L. B., Corcoles, M., Ayres, A. I., bin Ibrahim, M. Z., Masatsugu, B., Moreno, A., Carames, J., Begg, E., Strickland, L., Mazidzoglou, T., Padanyi, A., Munoz-Lopez, M., Takeuchi, T., Peters, M., Morris, R. G. M., & Tse, D. (2020). A stable home‐base promotes allocentric memory representations of episodic‐like everyday spatial memory. European Journal of Neuroscience, 51(7), 1539–1558. https://hdl.handle.net/10630/33342 10.1111/ejn.14681 A key issue in neurobiological studies of episodic-like memory is the geometric frame of reference in which memory traces of experience are stored. Assumptions are sometimes made that specific protocols favour either allocentric (map-like) or egocentric (body-centred) representations. There are, however, grounds for suspect- ing substantial ambiguity about coding strategy, including the necessity to use both frames of reference occasionally, but tests of memory representation are not rou- tinely conducted. Using rats trained to find and dig up food in sandwells at a par- ticular place in an event arena (episodic-like 'action-where' encoding), we show that a protocol previously thought to foster allocentric encoding is ambiguous but more predisposed towards egocentric encoding. Two changes in training protocol were examined with a view to promoting preferential allocentric encoding—one in which multiple start locations were used within a session as well as between sessions; and another that deployed a stable home-base to which the animals had to carry food re- ward. Only the stable home-base protocol led to excellent choice performance which rigorous analyses revealed to be blocked by occluding extra-arena cues when this was done after encoding but before recall. The implications of these findings for studies of episodic-like memory are that the representational framework of memory at the start of a recall trial will likely include a path direction in the egocentric case but path destination in the allocentric protocol. This difference should be observable in single-unit recording or calcium-imaging studies of spatially-tuned cells. eng http://creativecommons.org/licenses/by/4.0/ open access Attribution 4.0 Internacional Hipocampo (Cerebro) Memoria A stable home-base promotes allocentric memory representations of episodic-like everyday spatial memory. journal article